関連する実験動画
Updated: May 28, 2026

11:27
Analysis of SCAP N-glycosylation and Trafficking in Human Cells
Published on: November 8, 2016
飽和脂肪酸は,膜サブドメイン内のc-Srcクラスタリングを誘導し,JNK活性化につながります
Ryan G Holzer1, Eek-Joong Park, Ning Li
1Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
Cell
|October 4, 2011
まとめ
飽和脂肪酸は,Jun N-末端キナーゼ (JNK) を活性化し,c-Srcタンパク質の分布を変えることで,インスリンシグナル伝達を損なう. 不飽和脂肪酸はこれを防止し,グルコース代謝に対する有益な効果のための潜在的なメカニズムを提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- メタボリック疾患
背景:
- 飽和脂肪酸 (FA) は,インスリン抵抗性および2型糖尿病と関連しています.
- 飽和したFAによるJun N-末端キナーゼ (JNK) アクティベーションは,肥満とインスリン抵抗性に関連しています.
- 細胞シグナル伝達において,飽和型と不飽和型FAを区別するメカニズムは不明である.
研究 の 目的:
- 飽和脂肪酸と不飽和脂肪酸が,細胞の信号伝達経路によってどのように区別されるかを明らかにするために.
- インスリンシグナル伝達に対する飽和FAの影響を媒介するc-Src活性化の役割を調査する.
- JNKの活性化に対するFAの差異的な効果の基礎となる分子メカニズムを特定する.
主な方法:
- 飽和および不飽和のFAが脂肪細胞におけるc-Src膜分布および活性化に及ぼす影響を調査した.
- FA誘発のc-Src活性化がJNKシグナル伝達とインスリンシグナル伝達経路に与える影響を評価した.
- FA媒介によるc-SrcおよびJNK活性化におけるその役割を決定するために,ミリスチル化阻害を利用した.
主要な成果:
- 飽和FAは飽和FAではなく,c-Srcが細胞内膜のサブドメインに分割され,その活性化につながります.
- 活性化されたc-SrcはJNKの活性化と,飽和したFAによってインスリンシグナル伝達の抑制を媒介する.
- 不飽和のFAはc-Src膜の分割と活性化を阻害し,それによってJNKの活性化を阻害する.
- c-Srcのミリスチル化は,その膜分割と,飽和したFAによってその後の活性化に不可欠である.
- 高脂肪食は,ネズミの脂肪細胞におけるc-Srcの分割と活性化を誘発した.
結論:
- 飽和FAと不飽和FAの細胞差別には,c-Src膜の分布と活性化の調節が含まれています.
- 飽和したFAは,c-Src経路経由でインスリン抵抗性とJNK活性化を促します.
- 不飽和のFAは,c-Srcの活性化とダウンストリームシグナリングを防ぐことで保護効果を発揮する.
関連する概念動画
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...

